Small Update AFTER 2.2 OTA (question)

I just SBF'd back to 2.1 then grabbed the 2.2 OTA. If I root now, will I receive the SMS fix or should I wait for the fix then root? Also, people that were rooted on 2.1, did you receive the 2.2 OTA? or do you have to unroot to get let's say 3.0 in December/January

Rooting doesn't affect whether or not you get the OTA updates, unless you did something with your phone that you can only do with root, that made you somehow incapable of receiving the OTA updates. I'm referring to messing with the updater obviously.

It's when you're on a leaked copy of Froyo, on a custom ROM, etc. that receiving OTA updates becomes tedious.

Impossible to tell in advance. It's going to vary depending on the fix and how it's implemented. A fix could be as simple as replacing a .apk file, or they could drop a "small fix" into an entire re-write of the system folder. The "small fix" could even include patching the vulnerability that allows us to gain root right now.